View Poll Results: what drop in air filter did your car had when your maf went wrong?
OEM air filter
7
7.00%
HKS foam filter
26
26.00%
K&N air filter
15
15.00%
Works air filter
2
2.00%
Aftermarket filter, but no MAF issue
50
50.00%
Voters: 100. You may not vote on this poll
Poll which drop in air filter did you have when your maf died on your car?
But if I had to choose between your two, I'd definitely pick Works over K&N.
JDM Ralliart IMO. It's an amazingly built filter, sounds cool, and I got some decent gains off of it. All I have is a English Racing tune, Ralliart Drop-In, ETS FMIC, UICP, LICP and I made 85whp. (Still stock exhaust). I wanted to go to a cone style filter (blitz sus), but decided against it since there isn't really any restriction on the intake any more.
But if I had to choose between your two, I'd definitely pick Works over K&N.
But if I had to choose between your two, I'd definitely pick Works over K&N.
I've been running the Perrin drop in filter for almost 10,000 miles now with no problems. How many people started developing problems after they cleaned and oiled it themselves? Maybe some are just being too liberal with the oil coating.
Probably the works, I'm running 28psi, it just sounds like a jet the whole time. I don't get much of a blow off sound. Or maybe I just never focused on it since I usually have my stereo blasted 
. But really, if woosh is what you want, you want a cone filter. It's easy to change back if you have to go into the dealership.
. But really, if woosh is what you want, you want a cone filter. It's easy to change back if you have to go into the dealership.
i think this poll is going to pretty much show which aftermarket filter is most popular, not which is most prone to problems. if the MAF is crap, then the filter with the largest user base is going to show the most failures.
edit: what might make for a better poll:
[] Brand X - MAF problems
[] Brand X - No problems
for each brand.
edit: what might make for a better poll:
[] Brand X - MAF problems
[] Brand X - No problems
for each brand.
try k&n out! Just make sure you blot off some excess oil before the install 
I pulled my HKS filter apart and found a little bit of dust and a dead bee.
I've also had a rough idle/rough start sometimes but it is very rare. I will say that when re-inserting the HKS filter, I noticed it doesn't go all the way around the edges of the air box like the OEM one does. I jiggled mine around a little bit until I felt comfortable with the way it sat, maybe this is were the little bit of dust is coming from??
I've also had a rough idle/rough start sometimes but it is very rare. I will say that when re-inserting the HKS filter, I noticed it doesn't go all the way around the edges of the air box like the OEM one does. I jiggled mine around a little bit until I felt comfortable with the way it sat, maybe this is were the little bit of dust is coming from??
I checked and it didn't feel wet/dirty on the side after the filter. As soon as I put in the new sensor and cleared the code everything was good. I went back to the stock filter and I will say it actually shifts a little smoother.
Evolved Member
Joined: Jul 2008
Posts: 1,264
Likes: 1
From: Calgary, Alberta, Canada
I don't think I'm going to use my HKS filter. They just don't filter well enough and for the minor gains aren't worth the hassle. I have a Cosworth filter that I am going to try in the spring. It definately looks like a quality piece and that it would filter better than your typical aftermarket filter.